note 87795 added to function.sizeof
| From: | EmilMohamed at osu1 dot php dot net | Date: | Mon, 22 Dec 2008 09:04:40 +0000 |
| Subject: | note 87795 added to function.sizeof | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-148447@lists.php.net to get a copy of this message | ||
Here are real test for below statements:
Source:
<?php
$arr = array();
$num = 1000000;
echo "Populating test array with $num elements ... ";
for($i=0; $i<$num; $i++) {
$arr[$i] = microtime(true) . mt_rand();
}
echo "Populated.\n\n";
echo "Start testing FOREAH ... \n";
$start_time = microtime(true);
foreach ($arr as $i=>$elem) {
$res = isset($arr[$i]);
}
echo "FOREACH result: " . (microtime(true) - $start_time) . "\n\n";
echo "Start testing regular FOR ... \n";
$start_time = microtime(true);
for ($i=0; $i<sizeof($arr); $i++) {
$res = isset($arr[$i]);
}
echo "Regular for result: " . (microtime(true) - $start_time) . "\n\n";
echo "Starting test for pre-computed size array FOR ... \n";
$start_time = microtime(true);
$sizeof_arr = sizeof($arr);
for ($i=0; $i<$sizeof_arr; $i++) {
$res = isset($arr[$i]);
}
echo "pre-computed size of array FOR: " . (microtime(true) - $start_time);
?>
Output:
emil@neon:~$ php test-loops-performance.php
Populating test array with 1000000 elements ... Populated.
Start testing FOREAH ...
FOREACH result: 0.500122070312
Start testing regular FOR ...
Regular for result: 0.886044979095
Starting test for pre-computed size array FOR ...
pre-computed size of array FOR: 0.454435825348
----
Server IP: 217.75.128.29
Probable Submitter: 85.91.139.97
----
Manual Page -- http://www.php.net/manual/en/function.sizeof.php
Edit -- https://master.php.net/note/edit/87795
Del: integrated -- https://master.php.net/note/delete/87795/integrated
Del: useless -- https://master.php.net/note/delete/87795/useless
Del: bad code -- https://master.php.net/note/delete/87795/bad+code
Del: spam -- https://master.php.net/note/delete/87795/spam
Del: non-english -- https://master.php.net/note/delete/87795/non-english
Del: in docs -- https://master.php.net/note/delete/87795/in+docs
Del: other reasons-- https://master.php.net/note/delete/87795
Reject -- https://master.php.net/note/reject/87795
Search -- https://master.php.net/manage/user-notes.php